Use case

Sometimes it may consume all the IO bandwidth, and right now there is no way to stop it, except for restarting the server.

Describe the solution you'd like

Actually it should be pretty easy to implement, the only thing that should be added is the is_cancelled/cancellation_hook for copyData

Native copy could be ignored.

And also QueryStatus::isKilled should be checked before each copy as well.

Cc: @vitlibar